Patent GB-190321969-A (GB)
Title: Improvements in Platen Printing Presses
Inventor: HEIM JOSEF
Filed: 1903-10-12
Granted: 1904-01-21
Abstract: 21,969. Heim, J. Oct. 12. Platen presses ; inking-apparatus.- The bed 1 swings from the open position, shown in full lines, down to the platen, as shown in dotted lines. The bed 1 is completely balanced by an arm 2 extending from its fulcrum and connected by a rod 3 to a lever 4 carrying an adjustable weight 5. A cam 7 acting on a roller 12 on the lever 4 operates to raise the bed 1, the downward movement of the bed being produced by a spring or springs 8 connected at 9 to the arm 2, near the point of attachment of the rod 3, and at the lower end to an adjustable piece 10 on the lever 4. During the upward movement of the bed, the spring 8 is stretched, owing to the difference in distance of movements of the points 11, 10, and operates to check the upward movement of the bed, while the energy thus stored in the spring 8 effects the downward movement of the bed. In a modified arrangement, the balance weight 5 is on a separate lever connected to the arm 2 in such a manner that the weight reaches its lowest position before the bed reaches its highest position, and the weight is thus raised somewhat and operates to assist the spring 8 in checking the upward motion of the bed. Single, double, or continuous inking may be effected by means of a hook which may be engaged with the lever 4 at alternate operations &c. to prevent the downward movement of the bed. The hook is engaged and disengaged by a star cam operated by a ratchet device having an arm 30, Fig. 4, connected by a rod 29 to a lever 28 operated by a cam roller 27 on a disc 26 on the shaft 6. A hand-lever 36, connected by a rod 37 and links 38 to the rod 29 and ratchet gear, may be operated to reduce the effective length of the rod 29, and thus stop the operation of the ratchet so that the cam remains at rest with the hook in or out of engagement. Fig. 3 shows a diagrammatic view of means for inking the forme on the bed 1 when in its raised position. The inking-rollers are carried by the upper end of a rod 14 pivoted at 17 to an arm 16 on a rock - shaft 15. A spring 19 connected at 18 to an extension of the rod 14, is connected at 20 to a lever 21 pivoted on the arm 16. The other end 22 of the lever 21 is guided by a cam 23 so that the length and tension of the spring 19 remain approximately constant and the inking- rollers are moved with constant pressure over the forme. The spring 19 is shown in several different positions. A hand-operated means is provided for regulating or varying the supply of ink from the fountain or supply roll to the distributing-drum The vibrating roller 44, Fig. 6, which moves to and from the fountain roller and the distributing- drum is mounted on hand-levers 43 pivoted on the vibrating arms 41 and which may be freed by means of a pin 46 to be moved by hand independently of the arms 41. Fig. 9 shows a means for varying the extent of longitudinal movement of the distributing-rollers 48 on the ink drum 25. The rollers 48 are moved by levers 52<1> pivoted at 52 and formed with a slot engaging a pivot 54 adjustable on a slotted arm 51 operated by the cam 50. Fig. 11 shows a means for disengaging the driving gear of the inking-mechanism. The clutch to be engaged or disengaged is connected with the lever 59, moved by an oval shaped cam on a disc 56 having four pins engaged, to move the disc through a quarter turn, by an arm or pawl 55 pivoted on a treadle-lever 54.